So I will be Blooregard Q. Kazoo (Bloo) and you can either make an imaginary friend or these people listed:
Goo
Frankie
Madame Foster
Eduardo
Wilt
Coco (you have to translate her if you are her)
Mac
Mr. Herriman
...and that's all! if you figure out any other people in the show, you can be them! I hope we have a great time!